LoongArch: gas: Try to avoid R_LARCH_ALIGN associate with a symbol

LoongArch: gas: Try to avoid R_LARCH_ALIGN associate with a symbol

The R_LARCH_ALIGN need to associated with a symbol if .align has the first
and third expressions. If R_LARCH_ALIGN associate with a symbol, the addend can
represent the first and third expression of .align.

For '.align 3', the addend of R_LARCH_ALIGN only need to represent the alignment
and R_LARCH_ALIGN not need to associate with a symbol.

For '.align x, , y', R_LARCH_ALIGN need to associate with a symbol if 0 < y <
2^x - 4.